To type power indexes (for example, 2 as in cm2) and other special characters (for example, as in C), do the following:
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Run the Windows Character Map utility and select the appropriate character to copy, and then, select the Copy button.
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Do one of the following:
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Switch to the Import Utility and paste the character in the required location.
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Hold down ALT and, with the NUM LOCK indication on, type the required character's ASCII value (a four-digit number) using the keyboard numeric keypad (see your Windows User Guide for additional information about ASCII numbering).
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For example:
Type ALT + 178 to add: 2
Type ALT + 179 to add: 3